Improvement in self-centering chucks for lathes



dldi %iaire GEORGE o. DUGKLEY, orNnw BEDFORD, MASSACHUSETTS;

Letters Patent No. 112,119, dated February 28, 1871.

IMPROVEMENT IN SELF-CENTERING CHUCKS FOR LATHES.

The Schedule referred to in these Letters Patentv and making part of thesame.

To all persons to whom these presents may come yBe it known that I,GEORGE O. B'UcKnnY, of N ew Bedford,.of the county of Bristol and Stateof Massachusetts, have Vinvented a new and useful Self-Oentering Chuckfor Lathes and dovhereby declare the same to befnlly described in thefollowing specification and 'represented in the accompanying drawingmaking part thereof.

Of such drawing- Figure l is a side elevation;

Figure 2, afront-endl view;

Figure 3, a longitudinal section; and

Figure 4, a transverse section `ot' one of my-said chucks. I Y Y Figure5 is a front-end view of it as itappears with its cap-plate removed fromthe jawcarrier.

In such drawing- A A A denote three jaws arranged' radially from acommon center or axis, and within a carrier orv cyl indrical block, B,such being so as tol admit of each jaw being moved in a radial directiontoward and from the axis of the block, there beingwithin the .block acentral aperture, a. l

In the rear part of the block or jaw-carrier is a female screw, b, forthe purpose of fixing the chuck upon the arbor of a lathe.. y f Each ofthe jaws has its outer edge shaped as two inclined planes, c d, whichdecline in opposite directions from the middle of the jaw.

Furthermore, there rests against inclined planes of each jaw two wedges,C C, arranged therewith, in manner as represented, and projecting beyondthe jawcarrier, the wedges being disposed within the radial chambers orslits d for the reception of the jaws.

Enoompassing the series of wedges and jaws is af screws, G and H, cut onthe next adjacentledges of the wedges, thearrangement ofsueh screws andwedges being as represented.

Furthermore, each jaw is dovetailed to its two wedges, in manner asshown, at h, or so connectedv therewithas to be moved radially of theblock in onedireotion or the other by such wedges, while they may be inthe act ot' being moved either toward or away from each other by thesescrewsand'oollar while the latter may be in the act of being revolved.

Eaohof the wedges, c, is also douetailed within the jaw-rarrier, asshown at i t.

Figure 6 denotes an end view; and

Figure 7, a side view of one' oi' thejaws;

Figure 8A being a side view; and

Figure 9, an end view of one of the wedges.

Figure 10 is a longitudinal section and .Figure 11, a front-end view oithe jaw-carrier. Figure 12 is a section of the collar representing itsright-and-left screws.

By revolving the collar D the two wedges of each pair will besimultaneously moved in' opposite directions rectilinearly, and by beingsupported so that they cannot move radially, and by being dovetailed tothe jaw they will cause the jaw to have a lateral or radial movement. 4

All the jaws may thus simultaneously be moved either toward oraway fromthe axis of the carrier,-

and thereby be clamped upon an article or unclamped from it, as occasionmay require.

I am aware of the lathe-chuck described in the United States Patent N o.48,259,1and make no claim thereto.

I therefore claimlhe jaw-carrier or centerblock B, the rotary sleeve orcollar D, the wedges C, and the jaws'A, constructed, arranged, andcombined as described and represented, the whole constituting aself-centering lathe-chuck.

' l GEO. O. BUOKLEY.

Witnesses: Y

R. H. EDDY, J. It. SNOW.

